Tire-alarm.



0. F. MEYER 6.11. I. PAYNE.

TIRE ALARM. APPLICATION mm 1M. 3:. 1918.

Patented Mar. 25, 1919.

fie/M219 wow-114234 of the wheel, and 13 the valve UNITED STATES 13pmorr ca.

ornp r. mama AND JAMES I. PAYNE, or mm, camroamn.

TIRE-Annie .lphlication filed January 81. 1918.

To all whom, it may concern:

Be it knownthat we, Orro F. Mama and Jamie 'I. PAYNE, both citizens ofthe United States, residing at Taft, in the county of Kern and State ofCalifornia, have invented a new and useful Tire-Alarm, of which thefollowing is a specification.

Our invention relates to a tire alarm,being more particularly a deviceadapted to be placed on the valve stem of the common form of pneumatictire in use upon automobiles and the like.

The principal object of our invention is to produce a tire alarm ofsimple form and construction which may be placed upon the common valvestem of a pneumatic tire, and which may be readily adjusted to ive analarm of decrease of air pressure wit in the tire.

Referring to the drawings, which are for illustrative purposes only,

Figure 1 1s a side elevation of the device embodying a form of ourinvention, such device being placed upon the valve stem.

Fig. 2 is an enlarged vertical section of the device shown in Fig. l,and

Fig. 3 is a cross-sectional view on 3-3 of Fig. 2.

1O designates a common form of pneumatic tire, 11 the inner casing, 12the telly stem having arranged therein a common form of air valve 14. 15 designates a cat having a reduced'u'pper end 16 which is ield againsta seat 17 formed on the valve stem, hein securely held thereon b meansof a suitable union. 18 threaded on the valve stem 13.

The upper end of the cap 15 is provided with a central passage 20 thelower eudj of which is formed with a valve seat 21 adapted line toreceive the alarm valve 22 whichhs formed on a stem 23 extendingupwardly through the passage 20 and slidaible freely in the central bore24- of a Whistle 25, the whistle 25 consisting of a cylindrical cap, thelower end of which is interiorly threaded upon the upper end of the, cap16.

The whist e ings 26 which are in open communication with the interior ofthe whistle and the passage 20 in the top ofthc cap 16.

30 designates a pin which extends through the stem 23 of the valve 22,against which pin is seated a coiled spring 31 surrounding the stem 23,the upper end of which spring Specification of Letters Patent.

pressure in the tire,

25 is provided with two open-- Patented Mar. 25,1919.

Serial H 0. 214,776.

31 is seated against a circular shoulder portion 32 of the whistle. Whenthe tire alarm is placed .upon the valve stem of a pneumatic tire, theparts assume the position shown in Figs. 1 and 2 of the drawings. Inthis position an extension 34: of-the valvestem 23 engages the upper endof the stem 35 of the air valve epressing such valve from its seat, asshown in Fig. 2, thereby permittin open 5 communication from theinterior of t e tire to the valve 22 of the alarm, which pressurepresses such valve against its seat 21 thereby preventing the flow ofair from. the interior of the valve to the'whistle.

In the event of a; puncture or a slow leak it should happen that the airpremure Within the tire should decrease, the spring-31 would overcomethe pressure of the air in y the tire and would 0 en the valve 22 ere-7'5 by permitting air mm the til-e to 'i'ffss through the passage 20 inthe cap 16 to the whistle, and passing out of the 0 enings 26, wouldcause an audible alarm terdby a 71 prising the driver of the fact thatthe all to pressure in the tire had fallen to a dangerous point. It isunderstood that the whistle may be adjusted to give an alarm atdiflerent pressures, which is accomplished by turning the whistle cap 16thereby increasing or de- 35 creasing, as the case may he, the tensionon the spring 31-, it being also understood that the tension on thespring 3l regulates the pressure at which the secondary valve, that isthe valve in the cap, opens against the the primary valve, that is theordinary valve in the t re stem, being 'open at all times that the tirealarm is in place. I

We claim as our invention:-

1. In combination with a pneumatic tire valve, :1 cap adapted to fitover the stem of the tire valve, a valve in said cap arran ed to holdsaid tire valve open when the vtfive in saidpap is seated, a whistle onsaidcap, and elastic means for opening thewalve 1n the cap upon decreaseof air pressure in the tire.

2. In combination with a, pneumatic tire valve, a removable cap on saidvalve stem having an opening in itsuppcr end, a. valve for closing saidopening, means onsaid last named valve for unseating the tire valve whensaid valve in the cap is seated, elastic means for opening said valve inthe cap, a

whistle on said cap, and means for :avd'usting the position of saidwhistle L0 vary t e tension on said elastic means. v.

3. Incombination with a pneumatic tire valve, a removable ca seated onthe tire stem, a whistle adjusta' 1y mounted on said cap, a secondaryvalve in said cap, means on said secondar valve adapted to open the tirevalve wlien the secondary valve is seated, a stem on said secondaryvalve silid- 10 ably extending into the whistle body, a pin in saidstem, and a coiled sprin on said stem between said in am the whistlebody.

In testimony w ereof we have hereunto Set our hands at Los Angeles,California, 15

this 24th day of Janua y 1918.

GT (5 F. MEYER. JAMES I. PAYNE.

